#!/usr/bin/env python
# -*- coding:utf-8 -*-
import re

from django_redis import get_redis_connection
from rest_framework_jwt.settings import api_settings

from celery_tasks.email.tasks import send_verify_email
from goods.models import SKU
from users import constants
from .models import User, Address
from rest_framework import serializers


class CreateUserSerializer(serializers.ModelSerializer):
    password2 = serializers.CharField(label='确认密码', write_only=True)
    sms_code = serializers.CharField(label='短信验证码', write_only=True)
    allow = serializers.CharField(label='同意协议', write_only=True)

    token = serializers.CharField(label='登录状态token', read_only=True)  # 增加token字段

    class Meta:
        model = User
        fields = ('id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow', 'token')
        extra_kwargs = {
            'id': {'read_only': True},
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名'
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):
        '''手机号验证'''
        if not re.match(r'1[3-9]\d{9}', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def validated_allow(self, value):
        if value != 'true':
            raise serializers.ValidationError('未同意协议')
        return value

    def validate(self, attrs):
        # 判断两次密码
        password = attrs['password']
        password2 = attrs['password2']
        if password != password2:
            raise serializers.ValidationError('确认密码有误')

        # 判断短信验证码
        redis_conn = get_redis_connection('verify_codes')
        mobile = attrs['mobile']
        real_sms_code = redis_conn.get("sms_%s" % mobile)
        if real_sms_code is None:
            raise serializers.ValidationError('无效的短信验证码')
        sms_code = attrs['sms_code']
        # print('sms_code:',sms_code)
        # print("real_sms_code",real_sms_code)
        if sms_code != real_sms_code.decode():
            raise serializers.ValidationError('短信验证码有误xxxxx')

        return attrs

    def create(self, validated_data):
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']

        # user = User.objects.create(**validated_data)
        # user.save()

        user = super().create(validated_data)
        # 调用django的认证系统加密密码
        user.set_password(validated_data['password'])
        user.save()

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)

        user.token = token

        return user


class UserDetailSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('id', 'username', 'mobile', 'email', 'email_active')


class EmailSerializer(serializers.ModelSerializer):
    '''邮箱序列化器'''

    class Meta:
        model = User
        fields = ('id', 'email')
        extra_kwargs = {
            'email': {
                'required': True
            }
        }

    def update(self, instance, validated_data):
        email = validated_data['email']
        instance.email = email
        instance.save()
        # 生成邮箱验证链接
        verify_url = instance.generate_verify_email_url()
        # 发送邮件
        send_verify_email.delay(email, verify_url)

        return instance


class UserAddressSerializer(serializers.ModelSerializer):
    """
    用户地址序列化器
    """
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        '''验证手机号'''
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def create(self, validated_data):
        '''保存地址'''
        validated_data['user'] = self.context['request'].user
        return super().create(validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    '''地址标题'''

    class Meta:
        model = Address
        fields = ('title',)


class AddUserBrowsingHistorySerializer(serializers.Serializer):
    """
    添加用户浏览历史序列化器
    """
    sku_id = serializers.IntegerField(label='商品编号',min_value=1)
    def validate_sku_id(self,value):
        """检验sku_id是否存在"""
        try:
            SKU.objects.get(id=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('该商品不存在')
        return value

    def create(self, validated_data):
        user_id = self.context['request'].user.id
        sku_id = validated_data['sku_id']
        redis_conn = get_redis_connection('history')
        pl = redis_conn.pipeline()

        # 移除已经存在的本商品浏览记录
        pl.lrem('history_%s' % user_id,0,sku_id)
        # 添加新的浏览记录
        pl.lpush("history_%s" %user_id,sku_id)
        # 只保存最多5条记录
        pl.ltrim('history_%s' %user_id,0, constants.USER_BROWSING_HISTORY_COUNTS_LIMIT-1)
        pl.execute()
        return validated_data


class SKUSerializer(serializers.ModelSerializer):
    class Meta:
        model = SKU
        fields = ('id', 'name', 'price', 'default_image_url', 'comments')